JPH1183659A - Method for adjusting differential pressure transmitter and three-way valve therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust a differential pressure transmitter at the spot in a short time by closing right and left stop valves of a three-way valve, detaching a sealing member, mounting pressure adjustment devices having a fluid control valve to right and left fluid release openings and pressing a pressure medium to a fluid outflow path. SOLUTION: In adjusting a differential pressure transmitter 20, stop valves 12 are manipulated to close fluid outflow paths 17 which are communicated with right and left fluid inflow paths 13 of a valve main body 11, whereby a fluid 5 in the valve main body 11 is tightly sealed. Thereafter, right and left sealing members 18 are detached and fluid release openings 15 are opened. As a result, the fluid 5 present inside is emitted to the outside, and an indicator 22 of the differential pressure transmitter 20 shows a scale '0'. Then, pressure adjustment devices are fitted to the right and left fluid release openings 15 and a pressure medium is pressed to the right and left fluid outflow paths 17. At this time, a constant atmospheric pressure difference is set between the right and left pressure adjustment devices. If the indicator 22 of the differential pressure transmitter 20 displays a different difference from the preliminarily set constant atmospheric pressure difference, an adjustment screw or the like of the differential pressure transmitter 20 is manipulated and adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting a differential pressure transmitter and a three-way valve directly used for implementing the method.

[0002]

2. Description of the Related Art Generally, a differential pressure transmitter used in a pipe of an industrial plant knows a flow rate of a fluid in a pipe by measuring a pressure difference before and after an orifice portion (for example, a pipe orifice) of the pipe. For example, it is attached to the main pipe as shown in FIG. That is, 1B is the orifice part 2
B is the main pipe. The three-way valve 10B is connected to the upstream side portion 3B and the downstream side portion 4B of the main pipe 1B via left and right inflow branch pipes 7B, 7B, respectively. This Sangi valve 1
Reference numeral 0B denotes a pair of left and right stop valves 12 for stopping fluids such as air, oil, oxygen, etc. flowing from the main valves 6B, 6B provided in the left and right inflow branch pipes 7B, 7B, respectively.
B and 12B. The three-way valve 10B includes a pressure regulating valve 14B between the left and right stop valves, and has left and right fluid outflow passages 17B, 17B based on the pressure regulating valve 14B and the pair of left and right stop valves 12B, 12B. The differential pressure transmitter 20B is connected to the left and right pipes 19B, 19B in the left and right fluid outflow paths 17B, 17B of the three-way valve 10B.
B, via the joints 23B, 23B, it is provided detachably.

When checking or adjusting whether or not the differential pressure transmitter is operating normally, first, the three-way valve 10B
The left and right stop valves 12B, 12B are closed, then the differential pressure transmitter 20B is appropriately removed from the three-way valve 10B, and
The removed differential pressure transmitter 20B was carried to a manufacturer or a predetermined adjustment place.

Therefore, there is a problem that the adjustment of the differential pressure transmitter cannot be performed in a short time on site.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a first object of the present invention is to make adjustment of a differential pressure transmitter used in a piping line of an industrial plant short-term. Is what can be done in time. A second object is to provide a three-way valve that can easily adjust the differential pressure transmitter. A third object is to be able to implement it inexpensively.

[0006]

The method of adjusting a differential pressure transmitter according to the present invention comprises a three-way valve 10 connected to the main pipe 1 via left and right inflow branch pipes 7, respectively. In the method of adjusting the differential pressure transmitter 20 including the differential pressure transmitter 20 connected to the left and right fluid outflow passages 17 of the valve 10 via the left and right outflow pipes 19, the valve body of the three-way valve 10 A fluid inflow passage closing step A for closing the left and right stop valves 12 provided on the left and right, and a left and right fluid respectively communicating with the left and right fluid outflow passages 17 by removing a set of sealing members 18 from the valve body 11 A fluid draining opening opening step B for opening the draining opening 15, a pressure regulator mounting step C for attaching the pressure regulator 30 having the fluid control valve 31 to the left and right fluid draining openings 15, and a pressure medium supply. Pressure regulator 3 from source 35
0 to the left and right fluid outflow passages 1 of the valve body 11
7 and the differential pressure transmitter 20 is not removed from the three-way valve 10 if the pressure transmitter 20 is out of order, and the differential pressure transmitter 2 is visually inspected as it is.
And a differential pressure transmitter adjusting step E for adjusting 0.

In the above structure, in the opening step B for releasing the fluid, the sealing member 18 is a screw body, and the valve body 11 is closed.
It is characterized in that a screw body 18 screwed into a female screw 16 of an opening 15 formed in each of the left and right side wall portions 11a and 11b is removed by a tool. In the pressure regulator mounting step C, one pressure regulator 30 is connected to the valve body 11 in a two-system state.

The three-way valve for adjusting a differential pressure transmitter according to the present invention is
A pair of left and right stop valves 12 that are used directly in the implementation of the specific invention and are provided in the valve body 11 and open and close the left and right fluid inflow paths 13, and a pressure regulating valve 14 provided in the center of the valve body 11. , Left and right side wall portions 11a, 11 of the valve body 11
b, and a fluid draining opening 15 having a female thread 16 on the inner peripheral surface, and the left and right stop valves 1
2 and the left and right fluid outflow passages 17 formed in a cross shape so as to communicate with the left and right fluid draining openings 15 with the pressure regulating valve 14 as a boundary.
A pair of sealing members 18 are screwed into female threads 16 of the fluid drain opening 15 so as to be able to seal and open the 7 side.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below with reference to an embodiment in which a three-way valve provided with a pair of left and right sealing members is a constituent element. First, FIG. 1 is a schematic explanatory view showing a use state of a differential pressure transmitter 20 attached to a main fluid pipe (main pipe) 1 of an industrial plant via a three-way valve 10. The main pipe 1 has an orifice portion 2. With reference to the orifice portion 2, the upstream side portion 3 and the downstream side portion 4
Then, the flow and pressure of the fluid 5 such as air, oil, and oxygen change.

The differential pressure transmitter 20 is one of the instruments,
By measuring the pressure difference (differential pressure) between the left and right of the fluid 5 with respect to the orifice section 2 via the three-way valve 10, the flow rate of the main pipe 1 can be known. Therefore, FIG. 1 can also be said to be a schematic diagram showing a part of a main pipe flow measuring device in an industrial plant. In this type of flow measuring device, it is important that the differential pressure transmitter 20 is operating normally. Therefore, at the site, the differential pressure transmitter 20 is inspected and adjusted periodically or arbitrarily, and sometimes replaced with a normal one.

The three-way valve 10 is an example of an instrument used directly for implementing the method of the present invention. The three-way valve 10 is connected via a pair of left and right inflow branch pipes 7 having a main valve 6. Thus, based on the orifice section 2, one of the branch pipes 7 for inflow is connected to the upstream section 3 of the main pipe 1 and the other is connected to the downstream section 4 of the main pipe 1, respectively.

FIGS. 2 and 3 are schematic explanatory views showing the configuration of the three-way valve 10. The configuration of the three-way valve 10 will be described with reference to FIGS. 1, 2 and 3. It is a pair of left and right stop valves provided on the upper box-shaped valve body 11. These stop valves 12 are provided to open and close the left and right fluid inflow passages 13 connected to the pair of left and right inflow branch pipes 7 respectively.

Here, the configuration of the stop valve 12 will be briefly described. 12a is a needle or stem, 12b is a cylindrical stem guide, 12c is a first O-ring, 12d is a collar, 12e is a second O-ring, 12f is a ground nut, 12g is a handle, and 12h is a small lock nut.

Next, reference numeral 14 denotes a pressure regulating valve provided at the center of the valve body 11, and this pressure regulating valve 14 is slightly offset rearward (backward) with respect to the left and right stop valves 12 as shown in FIG. Is provided. This pressure regulating valve 14 is also a stop valve 1
As in the case of 2, it has components such as a needle, an O-ring, a collar, a lock nut, and a handle.

Next, reference numeral 15 denotes left and right side wall portions 11 of the valve body 11.
a and 11b are fluid drain openings having internal threads 16 on the inner peripheral surface. These fluid draining openings 15 communicate with the left and right fluid outflow passages 17 formed in the valve body 11 in a crossing manner with the left and right stop valves 12 and the pressure regulating valve 14 as boundaries.

The left and right fluid discharge openings 15 have a larger diameter than the fluid outflow passage 17, and are sealed by a pair of left and right screw members 18 which are examples of a sealing member in this embodiment. . The screw body 18 includes a nut head 18a and a male screw portion 18b that is connected to the nut head 18a and that is screwed with the female screw 16 of the opening 15.

Next, the above-mentioned differential pressure transmitter 20 is mounted on the valve body 1.
It is attached to the three-way valve 10 via a pair of left and right outflow pipes 19 fixedly arranged on the other side of the valve 1. The pair of left and right fluid inflow ports 21 of the differential pressure transmitter 20 communicate with the left and right fluid outflow paths 17 of the valve body 11 via these outflow pipes 19, respectively.

Thus, the differential pressure transmitter 20 has the visible indicator 22 and is connected to the outflow pipe 19 via the joint 23 in this embodiment.

Next, a method of adjusting the differential pressure transmitter 20 having the above-mentioned three-way valve 10 as a main part will be described. FIG. 4 is an overall schematic process diagram of the present invention. In the description of the method invention, the partial names and reference numerals of the respective units of the apparatus described above are used for convenience.

First, A is a main pipe 1 having an orifice portion 2.
One three-way valve 10 connected to the upstream side part 3 and the downstream side part 4 via left and right inflow branch pipes 7 respectively, and a pair of right and left outflows in the left and right fluid outflow passages 17 of the three-way valve 10. In the adjusting method of the differential pressure transmitter 20 including the differential pressure transmitter 20 connected via the pipe 19 for the right and left, the left and right stop valves 12 provided on the valve body 11 of the three-way valve 10 are closed respectively. This is a fluid inflow passage closing step for closing the left and right fluid inflow passages 13 formed in the valve body 11. In the fluid inflow passage closing step A, when the handle 12g of the stop valve 12 is operated, the fluid outflow passages 17 that have been in communication with the left and right fluid inflow passages 13 of the valve body 11, respectively, are closed.

Therefore, the fluid (for example, air) 5 existing in each of the left and right fluid outflow passages 17 of the valve body 11 is
One stop valve 12 and one sealing member 18 attached to the valve body to seal the fluid outflow passage of the valve body 11
And the fluid pressure inlet 2 of the differential pressure transmitter 2 is partitioned, so that the so-called left and right fluid outflow passages 17 are sealed.

Next, step B is a fluid release opening opening step for opening the left and right fluid release openings 15 respectively communicating with the left and right fluid outflow passages 17 formed in the valve body 11 in a cross shape. As described above, the left and right side walls 1 of the valve body 11
Since a pair of left and right sealing members 18 are screwed to 1a and 11b, respectively, these sealing members 18 are removed from the valve body 11 using a tool (not shown) (for example, a spanner). Thus, as shown in FIG. 5, the left and right sealing members 1 individually sealing the left and right fluid outflow passages 17 of the valve body 11.
8 and the left and right fluid drain openings 1 of the valve body 11
When the valve 5 is opened, the fluids respectively present on the left and right fluid outflow paths 17 are discharged to the outside (atmosphere). At this time, the pointer gauge 22 of the differential pressure transmitter 2 indicates the scale "O", but in this state, it is not known whether the differential pressure transmitter 2 is normal or not. Therefore, the following steps are performed.

Step C is a pressure regulator mounting step for mounting the pressure regulator 30 in the left and right fluid vent openings 15 of the valve body 11. In the present embodiment, as shown in FIG.
Numeral 0 has a fluid control valve (for example, a pressure reducing valve) 31 and is indirectly attached to the left and right fluid vent openings 15 via left and right pressure medium supply pipes 32 and a plurality of joints 33.
That is, one pressure regulator 30 is appropriately connected to the valve body 11 via the joint 33 in two systems. The pressure regulator 30 has a plurality of (at least two) pointer meters 34.
Is provided.

D is a pressure regulator 3 from the pressure medium supply source 35.
0 to the left and right fluid outflow passages 1 of the valve body 11
7 is a pressure medium supply step of pressure feeding. As the pressure medium supply source 35, for example, an air compressor is used.

Thus, the pressure medium from the pressure medium supply source 35 is depressurized and adjusted by the pressure regulator 30, and is supplied to the left and right fluid outflow passages 17 of the valve body 11 via the left and right pressure medium supply pipes 32, respectively. At this time, for example, “5 atm” is supplied to the left pressure medium supply pipe 32, and “7 atm” is supplied to the right pressure medium supply pipe 32. Therefore,
If the differential pressure transmitter 20 is normal, the pointer meter 22 indicates “plus / minus 2 atm”. At this time, if the differential pressure transmitter 20 is abnormal, the scale of the pointer meter 22 is “O”, or “plus / minus 1 atm”, or “plus / minus 3 atm or more”.

In the case of E, if the differential pressure transmitter 20 is out of order, the differential pressure transmitter 20 is not removed from the three-way valve 10. This is a differential pressure transmitter adjusting step in which the differential pressure transmitter 20 is operated and visually adjusted.

As described above, the method of the present invention is provided with a set of sealing members 18, and when these sealing members are removed, the left and right fluid outflow passages 17 of the valve body 11 respectively communicate with the left and right fluid outflow passages 17. Using the three-way valve 10 with the fluid vent opening 15 opened, the operator checks or adjusts whether the differential pressure transmitter 10 is operating normally.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the pressure regulator mounting step C of the present invention, one pressure regulator 30 is connected to the valve body 11 in a two-system state. May be used. In this case, two pressure regulators are individually connected to one pressure medium supply source 35, and
The left and right pressure medium supply pipes 32 are connected to these pressure regulators.

[0029]

As is clear from the above description, the present invention has the following effects. (1) Since there is no need to remove the differential pressure transmitter from the Sanki valve,
The adjustment of the differential pressure transmitter used in the piping line of the industrial plant can be performed on site in a short time. (2) Since the sealing member is a threaded body that is screwed into the female thread at the opening of the valve body, the differential pressure transmitter can be easily adjusted by using a general tool. (3) Since no special device is required, implementation can be performed at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an example of an embodiment of the present invention.

FIG. 2 is an explanatory view from the front of a three-way valve used directly in the practice of the present invention.

FIG. 3 is an explanatory view from the plane in FIG. 2;

FIG. 4 is a process chart of the present invention.

FIG. 5 is a schematic explanatory view showing a part of a process (a fluid draining opening opening process B).

FIG. 6 is a schematic explanatory view showing a part of the process (pressure regulator mounting process C, pressure medium supply process D).

FIG. 7 is a schematic explanatory view showing an example of the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main pipe, 2 ... Orifice part, 3 ... Upstream side part, 4 ... Downstream side part, 7 ... Branch pipe for inflow, 10 ... Sanki valve, 11 ... Valve body, 12 ... Stop valve, 13 ... Fluid inflow path , 14 ... pressure regulating valve, 15 ... fluid vent opening, 16 ... female thread, 17 ... fluid outflow passage, 20 ... differential pressure transmitter, 22 ... pointer gauge, 30 ... pressure regulator, 31 ... fluid control valve, 32 ... Pressure medium supply pipe,
35: pressure medium supply source, A: fluid inflow passage closing step, B:
Fluid drain opening opening step, C: pressure regulator mounting step, D: pressure medium supply step, E: differential pressure transmitter adjustment step.

Claims (4)

[Claims] 1. A main pipe 1 has left and right inflow branch pipes 7, respectively.
One three-way valve 10 connected through the
And a differential pressure transmitter 20 connected to left and right fluid outflow passages 17 via left and right outflow pipes 19.
In the adjustment method of 0, a fluid inflow passage closing step A for closing left and right stop valves 12 provided on the valve body 11 of the three-way valve 10 respectively, and a set of sealing members 1 from the valve body 11
8, a fluid draining opening opening step B for opening the left and right fluid draining openings 15 communicating with the left and right fluid outflow passages 17, respectively. Pressure regulator mounting step C for mounting the pressure regulator 30 having a pressure medium supply step, and a pressure medium supply step D for pressure-feeding the pressure medium from the pressure medium supply source 35 via the pressure regulator 30 to the left and right fluid outflow passages 17 of the valve body 11. And differential pressure transmitter 2
If there is a deviation in 0, the differential pressure transmitter 20 comprises a differential pressure transmitter adjustment step E for visually adjusting the differential pressure transmitter 20 without removing the differential pressure transmitter 20 from the three-way valve 10. Adjustment method 2. The valve body 1 according to claim 1, wherein, in the fluid-bleeding opening opening step B, the sealing member 18 is a screw body.
1. A method for adjusting a differential pressure transmitter, characterized in that a screw body 18 screwed into a female screw 16 of an opening 15 formed in each of the left and right side walls 11a and 11b is removed by a tool. 3. The method for adjusting a differential pressure transmitter according to claim 1, wherein in the pressure regulator mounting step C, one pressure regulator 30 is connected to the valve body 11 in a two-system state. . 4. A pair of left and right stop valves 12 provided on the valve body 11 and opening and closing the left and right fluid inflow passages 13;
A pressure regulating valve 14 provided at a central portion of the valve body 11, a fluid draining opening 15 formed on each of left and right side walls 11a and 11b of the valve body 11 and having a female thread 16 on an inner peripheral surface; Left and right stop valves 12 and pressure regulating valves 14
And the left and right fluid outflow passages 17 formed in a cross shape so as to communicate with the left and right fluid draining openings 15 respectively, and these fluid outflow passages 17 are sealed and opened. A three-way valve for adjusting a differential pressure transmitter, comprising: a set of sealing members 18 respectively screwed into female threads 16 of the fluid draining opening 15 so as to be able to perform the operation.